Investment in Joint Venture Arrangements Investment in Joint Venture Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity invested in LLCs	$ 0.8	$ 2.4
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Discount Rate Used in Determining Fair Value of land and lots	13.00%	13.00%
Equity Method Investment, Ownership Percentage	25.00%	25.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Discount Rate Used in Determining Fair Value of land and lots	16.00%	16.00%
Equity Method Investment, Ownership Percentage	74.00%	74.00%